The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/riscv/riscv/stack_machdep.c

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    1 /*-
    2  * Copyright (c) 2016 Ruslan Bukin <br@bsdpad.com>
    3  * All rights reserved.
    4  *
    5  * Portions of this software were developed by SRI International and the
    6  * University of Cambridge Computer Laboratory under DARPA/AFRL contract
    7  * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
    8  *
    9  * Portions of this software were developed by the University of Cambridge
   10  * Computer Laboratory as part of the CTSRD Project, with support from the
   11  * UK Higher Education Innovation Fund (HEIF).
   12  *
   13  * Redistribution and use in source and binary forms, with or without
   14  * modification, are permitted provided that the following conditions
   15  * are met:
   16  * 1. Redistributions of source code must retain the above copyright
   17  *    notice, this list of conditions and the following disclaimer.
   18  * 2. Redistributions in binary form must reproduce the above copyright
   19  *    notice, this list of conditions and the following disclaimer in the
   20  *    documentation and/or other materials provided with the distribution.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD: releng/11.2/sys/riscv/riscv/stack_machdep.c 296614 2016-03-10 15:51:43Z br $");
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/proc.h>
   41 #include <sys/stack.h>
   42 
   43 #include <machine/vmparam.h>
   44 #include <machine/pcb.h>
   45 #include <machine/stack.h>
   46 
   47 static void
   48 stack_capture(struct stack *st, struct unwind_state *frame)
   49 {
   50 
   51         stack_zero(st);
   52 
   53         while (1) {
   54                 unwind_frame(frame);
   55                 if (!INKERNEL((vm_offset_t)frame->fp) ||
   56                      !INKERNEL((vm_offset_t)frame->pc))
   57                         break;
   58                 if (stack_put(st, frame->pc) == -1)
   59                         break;
   60         }
   61 }
   62 
   63 void
   64 stack_save_td(struct stack *st, struct thread *td)
   65 {
   66         struct unwind_state frame;
   67 
   68         if (TD_IS_SWAPPED(td))
   69                 panic("stack_save_td: swapped");
   70         if (TD_IS_RUNNING(td))
   71                 panic("stack_save_td: running");
   72 
   73         frame.sp = td->td_pcb->pcb_sp;
   74         frame.fp = td->td_pcb->pcb_s[0];
   75         frame.pc = td->td_pcb->pcb_ra;
   76 
   77         stack_capture(st, &frame);
   78 }
   79 
   80 int
   81 stack_save_td_running(struct stack *st, struct thread *td)
   82 {
   83 
   84         return (EOPNOTSUPP);
   85 }
   86 
   87 void
   88 stack_save(struct stack *st)
   89 {
   90         struct unwind_state frame;
   91         uint64_t sp;
   92 
   93         __asm __volatile("mv %0, sp" : "=&r" (sp));
   94 
   95         frame.sp = sp;
   96         frame.fp = (uint64_t)__builtin_frame_address(0);
   97         frame.pc = (uint64_t)stack_save;
   98 
   99         stack_capture(st, &frame);
  100 }

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